This would be an uncomfortable moment in the spirit of "...the calls are coming from inside the house!"

The Calls Are Coming From Inside The House - Television Tropes & Idioms

FO on phone: "Hello officer, it's me again. We just landed, and have you had a chance to run a trace on my equipment?"

Police: "We did, and we show your device is still on the flight deck."

Captain looks away sheepishly and spins the locks on his flight case...